The mower I have now don't even have a drain plug. You either never change the oil or you tip the mower over and pour the oil out the fill tube...I guess most of the new ones are going that route now...every 10 cents saved not drilling and tapping a hole in the sump and putting in a drain plug adds up after a few engines LOL. I assume the el-cheapo ones you find at a lot of the box stores are that way, the ones at dealers are probably still old school with drain plugs, haven't checked any dealers lately though.
I really need to pull the old Echo 302s chainsaw out and see if it'll start, may need a carb for it, I haven't ran that thing in a couple years now sadly. Poor thing has been beat up, put away dirty and never properly maintained, time to dig it out and give it a nice cleaning, tune-up carb replacement, etc. Had a Poulan Pro saw for a couple years, the old Echo is still going, the Poulan already died LOL. Want to get a Stihl but heck don't use a chainsaw often enough anymore to really mess with a gas saw anymore.
I run Tru-Fuel in my leaf blower and trimmer as I don't use them every week, maybe once or twice a month. Put the blower away last fall with fuel in it, started right up this spring. Just bought the trimmer this year and its had Tru-Fuel in it since I got it.
Lawn mower & lawn tractor both get non-ethanol fuel, the lawn mower I run out of fuel at the end of the season, the lawn tractor gets the snow blower mounted on it in the fall and gets used through the winter so it don't need much in the way of fuel treatment, although I put a bottle of fuel system cleaner in the gas when I fill the can up so the mower and lawn tractor get fuel cleaner every tank of fuel regardless.